Britain's Prince William and his wife Catherine, Duchess of Cambridge, arrive at the Forts-de-Levis Community celebration, in Levis, Quebec, on the fourth day of their nine-day tour of Canada on July 3, 2011.

A pleasure boat passes by as Britain's Prince William and his wife Catherine, Duchess of Cambridge, arrive aboard Her Majesty's Canadian Ship Montreal in Quebec City on the fourth day of their nine-day tour of Canada on July 3, 2011.

Catherine, Duchess of Cambridge, greets members of the Canadian navy after disembarking the HMCS Montreal in Quebec City on July 3, 2011. Prince William and his wife Catherine are on a royal tour of North America from June 30 to July 8.

Prince William and Catherine, the Duke and Duchess of Cambridge, disembark HMCS Montreal in Champlain Harbour on July 3, 2011 in Quebec, Canada. The newly-married Royal Couple are on the fourth day of their first joint overseas tour. The 12-day visit to North America will take in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary.

Kate, the Duchess of Cambridge, smiles as she and the Duke visit Maison Dauphine in Quebec City on Sunday, July 3, 2011. Maison Dauphine provides shelter and services to underprivileged children and families.

One of the Governor General's foot guards is seen with the Royal 22nd Regiment's mascot goat "Baptiste," as the Duke and the Duchess of Cambridge arrive at the Citadel in Quebec City on Sunday, July 3, 2011.

People cheer and take pictures as Prince William and his wife Catherine, Duchess of Cambridge, attend a ceremony at City Hall in Quebec City on the fourth day of their nine-day tour of Canada on July 3, 2011.

Prince William and Kate, the Duke and Duchess of Cambridge, look up at the tree which was planted by Princess Diana and Prince Charles, near where the royal couple just planted their tree, during a tree-planting ceremony at Rideau Hall in Ottawa, Canada, on July 2, 2011.

Prince William and Kate, the Duke and Duchess of Cambridge, take part in a ceremonial tree plating with Governor General David Johnston and his wife, Sharon, at Rideau Hall in Ottawa, Canada, on July 2, 2011.

Prince William and Kate, the Duke and Duchess of Cambridge, take part in a ceremonial tree plating with Governor General David Johnston and his wife, Sharon, at Rideau Hall in Ottawa, Canada, on July 2, 2011.

Prince William and Kate, the Duke and Duchess of Cambridge, take part in a ceremonial tree planting as Governor General David Johnston, right, and his wife, Sharon, watch at Rideau Hall in Ottawa, Canada, on July 2, 2011.

Prince William and wife Kate, the Duke and Duchess of Cambridge walk behind a bagpiper as they arrive for a ceremonial tree planting accompanied Governor General David Johnston at Rideau Hall in Ottawa, Canada on July 2, 2011.